Go to the auction to buy it. 7G or so. The reward for this task is very useful. Most of the paintings you want to learn about jewelry in the future need this in exchange. The purple gem has four paintings, and the blue gem has three paintings.

When downloading the copy, mobster may drop a necklace called "Broken Necklace", which will trigger a task. This task is the same as you asked. This task needs a small green stone, and the reward is also that small medal. This "necklace" can be auctioned at prices ranging from 300 grams to 500 grams.

At the age of 80, the jewelry trainer in Dalaran Magic District must complete a task every day, and reward a small medal and 13G every day.

Don't change blueprints just for medals, it's not worth the candle. Spend some money on auction to buy a picture of the world's depravity, or spend some money to make your own gem punching skills (my experience and lessons)